Natural control of Acanthoscelides obtectus Say in creole corn seeds in the Seridó Oriental of Paraíba

Abstract

The usage of natural insecticides in the control of pest in storage grains has shown considerable promise, because it is a possibility of controlling the environmental conditions at the storage facilities interior, providing a maximization of the insecticides activity. The experiment was conducted in the Laboratory of Seeds at the Instituto Federal de Educação, Ciência e Tecnologia da Paraíba (IFPB), campus of Picuí – PB. The adopted experimental   design was entirely with 5 treatments and 4 repetitions, the dosages used for the experiment were (0,0; 2,0; 4,0; 6,0; 8,0 gramas) of Jurubeba powder. The analysis parameters for the experiment were: The number of live insects (NLI), number of dead insects (NDI). The results were analysed by th Computacional Sistem SISVAR, the results of the search data were submitted for analysis of variance and for comparison of measures by the test of F (p<0,05) in terms of the dosages effects, were adjusted to the regression equations. The analysis of variance showed that the number of live insects (NLI) and the number of dead insects (NDI) showed significant effect. The Jurubeba powder (Solanum paniculatum L) showed to be efficient in the control of Acanthoscelides obtectus Say. The mortality rate of the specie A. obtectus S. were influenced directly by the dosage and by the time of exposure. In the Caupi beans (Vigna unguiculata L.) the weevils A. obtectus S. has obtained approximately 87,5% of mortality in the dosage by 6 g of Jurubeba powder, and 82 % of mortality in the storage period.